6" Class 150 Flange Bolt Kit ASTM A307 Grade A Zinc$27.63PriceQuantity*Add to CartBuy NowComplete Class 150 flange bolt kit for 6" ASME B16.5 flanges. Contents: (8) 3/4"-10 × 3-1/2" ASTM A307 Grade A Zinc-Plated Hex Machine Bolts and (8) 3/4"-10 Zinc Finish Hex Nuts.